/* * V4L2 buffer helper functions. * * Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org> * Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <linux/videodev2.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <unistd.h> #include <fcntl.h> #include <poll.h> #include "libavcodec/avcodec.h" #include "libavcodec/internal.h" #include "libavutil/pixdesc.h" #include "v4l2_context.h" #include "v4l2_buffers.h" #include "v4l2_m2m.h" #define USEC_PER_SEC 1000000 static AVRational v4l2_timebase = { 1, USEC_PER_SEC }; static inline V4L2m2mContext *buf_to_m2mctx(V4L2Buffer *buf) { return V4L2_TYPE_IS_OUTPUT(buf->context->type) ? container_of(buf->context, V4L2m2mContext, output) : container_of(buf->context, V4L2m2mContext, capture); } static inline AVCodecContext *logger(V4L2Buffer *buf) { return buf_to_m2mctx(buf)->avctx; } static inline AVRational v4l2_get_timebase(V4L2Buffer *avbuf) { V4L2m2mContext *s = buf_to_m2mctx(avbuf); if (s->avctx->pkt_timebase.num) return s->avctx->pkt_timebase; return s->avctx->time_base; } static inline void v4l2_set_pts(V4L2Buffer *out, int64_t pts) { int64_t v4l2_pts; if (pts == AV_NOPTS_VALUE) pts = 0; /* convert pts to v4l2 timebase */ v4l2_pts = av_rescale_q(pts, v4l2_get_timebase(out), v4l2_timebase); out->buf.timestamp.tv_usec = v4l2_pts % USEC_PER_SEC; out->buf.timestamp.tv_sec = v4l2_pts / USEC_PER_SEC; } static inline int64_t v4l2_get_pts(V4L2Buffer *avbuf) { int64_t v4l2_pts; /* convert pts back to encoder timebase */ v4l2_pts = (int64_t)avbuf->buf.timestamp.tv_sec * USEC_PER_SEC + avbuf->buf.timestamp.tv_usec; return av_rescale_q(v4l2_pts, v4l2_timebase, v4l2_get_timebase(avbuf)); } static enum AVColorPrimaries v4l2_get_color_primaries(V4L2Buffer *buf) { enum v4l2_ycbcr_encoding ycbcr; enum v4l2_colorspace cs; cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ? buf->context->format.fmt.pix_mp.colorspace : buf->context->format.fmt.pix.colorspace; ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ? buf->context->format.fmt.pix_mp.ycbcr_enc: buf->context->format.fmt.pix.ycbcr_enc; switch(ycbcr) { case V4L2_YCBCR_ENC_XV709: case V4L2_YCBCR_ENC_709: return AVCOL_PRI_BT709; case V4L2_YCBCR_ENC_XV601: case V4L2_YCBCR_ENC_601:return AVCOL_PRI_BT470M; default: break; } switch(cs) { case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_PRI_BT470BG; case V4L2_COLORSPACE_SMPTE170M: return AVCOL_PRI_SMPTE170M; case V4L2_COLORSPACE_SMPTE240M: return AVCOL_PRI_SMPTE240M; case V4L2_COLORSPACE_BT2020: return AVCOL_PRI_BT2020; default: break; } return AVCOL_PRI_UNSPECIFIED; } static enum AVColorRange v4l2_get_color_range(V4L2Buffer *buf) { enum v4l2_quantization qt; qt = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ? buf->context->format.fmt.pix_mp.quantization : buf->context->format.fmt.pix.quantization; switch (qt) { case V4L2_QUANTIZATION_LIM_RANGE: return AVCOL_RANGE_MPEG; case V4L2_QUANTIZATION_FULL_RANGE: return AVCOL_RANGE_JPEG; default: break; } return AVCOL_RANGE_UNSPECIFIED; } static enum AVColorSpace v4l2_get_color_space(V4L2Buffer *buf) { enum v4l2_ycbcr_encoding ycbcr; enum v4l2_colorspace cs; cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ? buf->context->format.fmt.pix_mp.colorspace : buf->context->format.fmt.pix.colorspace; ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ? buf->context->format.fmt.pix_mp.ycbcr_enc: buf->context->format.fmt.pix.ycbcr_enc; switch(cs) { case V4L2_COLORSPACE_SRGB: return AVCOL_SPC_RGB; case V4L2_COLORSPACE_REC709: return AVCOL_SPC_BT709; case V4L2_COLORSPACE_470_SYSTEM_M: return AVCOL_SPC_FCC; case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_SPC_BT470BG; case V4L2_COLORSPACE_SMPTE170M: return AVCOL_SPC_SMPTE170M; case V4L2_COLORSPACE_SMPTE240M: return AVCOL_SPC_SMPTE240M; case V4L2_COLORSPACE_BT2020: if (ycbcr == V4L2_YCBCR_ENC_BT2020_CONST_LUM) return AVCOL_SPC_BT2020_CL; else return AVCOL_SPC_BT2020_NCL; default: break; } return AVCOL_SPC_UNSPECIFIED; } static enum AVColorTransferCharacteristic v4l2_get_color_trc(V4L2Buffer *buf) { enum v4l2_ycbcr_encoding ycbcr; enum v4l2_xfer_func xfer; enum v4l2_colorspace cs; cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ? buf->context->format.fmt.pix_mp.colorspace : buf->context->format.fmt.pix.colorspace; ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ? buf->context->format.fmt.pix_mp.ycbcr_enc: buf->context->format.fmt.pix.ycbcr_enc; xfer = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ? buf->context->format.fmt.pix_mp.xfer_func: buf->context->format.fmt.pix.xfer_func; switch (xfer) { case V4L2_XFER_FUNC_709: return AVCOL_TRC_BT709; case V4L2_XFER_FUNC_SRGB: return AVCOL_TRC_IEC61966_2_1; default: break; } switch (cs) { case V4L2_COLORSPACE_470_SYSTEM_M: return AVCOL_TRC_GAMMA22; case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_TRC_GAMMA28; case V4L2_COLORSPACE_SMPTE170M: return AVCOL_TRC_SMPTE170M; case V4L2_COLORSPACE_SMPTE240M: return AVCOL_TRC_SMPTE240M; default: break; } switch (ycbcr) { case V4L2_YCBCR_ENC_XV709: case V4L2_YCBCR_ENC_XV601: return AVCOL_TRC_BT1361_ECG; default: break; } return AVCOL_TRC_UNSPECIFIED; } static void v4l2_free_buffer(void *opaque, uint8_t *unused) { V4L2Buffer* avbuf = opaque; V4L2m2mContext *s = buf_to_m2mctx(avbuf); if (atomic_fetch_sub(&avbuf->context_refcount, 1) == 1) { atomic_fetch_sub_explicit(&s->refcount, 1, memory_order_acq_rel); if (s->reinit) { if (!atomic_load(&s->refcount)) sem_post(&s->refsync); } else { if (s->draining && V4L2_TYPE_IS_OUTPUT(avbuf->context->type)) { /* no need to queue more buffers to the driver */ avbuf->status = V4L2BUF_AVAILABLE; } else if (avbuf->context->streamon) ff_v4l2_buffer_enqueue(avbuf); } av_buffer_unref(&avbuf->context_ref); } } static int v4l2_buf_increase_ref(V4L2Buffer *in) { V4L2m2mContext *s = buf_to_m2mctx(in); if (in->context_ref) atomic_fetch_add(&in->context_refcount, 1); else { in->context_ref = av_buffer_ref(s->self_ref); if (!in->context_ref) return AVERROR(ENOMEM); in->context_refcount = 1; } in->status = V4L2BUF_RET_USER; atomic_fetch_add_explicit(&s->refcount, 1, memory_order_relaxed); return 0; } static int v4l2_buf_to_bufref(V4L2Buffer *in, int plane, AVBufferRef **buf) { int ret; if (plane >= in->num_planes) return AVERROR(EINVAL); /* even though most encoders return 0 in data_offset encoding vp8 does require this value */ *buf = av_buffer_create((char *)in->plane_info[plane].mm_addr + in->planes[plane].data_offset, in->plane_info[plane].length, v4l2_free_buffer, in, 0); if (!*buf) return AVERROR(ENOMEM); ret = v4l2_buf_increase_ref(in); if (ret) av_buffer_unref(buf); return ret; } static int v4l2_bufref_to_buf(V4L2Buffer *out, int plane, const uint8_t* data, int size, int offset, AVBufferRef* bref) { unsigned int bytesused, length; if (plane >= out->num_planes) return AVERROR(EINVAL); length = out->plane_info[plane].length; bytesused = FFMIN(size+offset, length); memcpy((uint8_t*)out->plane_info[plane].mm_addr+offset, data, FFMIN(size, length-offset)); if (V4L2_TYPE_IS_MULTIPLANAR(out->buf.type)) { out->planes[plane].bytesused = bytesused; out->planes[plane].length = length; } else { out->buf.bytesused = bytesused; out->buf.length = length; } return 0; } static int v4l2_buffer_buf_to_swframe(AVFrame *frame, V4L2Buffer *avbuf) { int i, ret; frame->format = avbuf->context->av_pix_fmt; for (i = 0; i < avbuf->num_planes; i++) { ret = v4l2_buf_to_bufref(avbuf, i, &frame->buf[i]); if (ret) return ret; frame->linesize[i] = avbuf->plane_info[i].bytesperline; frame->data[i] = frame->buf[i]->data; } /* fixup special cases */ switch (avbuf->context->av_pix_fmt) { case AV_PIX_FMT_NV12: case AV_PIX_FMT_NV21: if (avbuf->num_planes > 1) break; frame->linesize[1] = avbuf->plane_info[0].bytesperline; frame->data[1] = frame->buf[0]->data + avbuf->plane_info[0].bytesperline * avbuf->context->format.fmt.pix_mp.height; break; case AV_PIX_FMT_YUV420P: if (avbuf->num_planes > 1) break; frame->linesize[1] = avbuf->plane_info[0].bytesperline >> 1; frame->linesize[2] = avbuf->plane_info[0].bytesperline >> 1; frame->data[1] = frame->buf[0]->data + avbuf->plane_info[0].bytesperline * avbuf->context->format.fmt.pix_mp.height; frame->data[2] = frame->data[1] + ((avbuf->plane_info[0].bytesperline * avbuf->context->format.fmt.pix_mp.height) >> 2); break; default: break; } return 0; } static int v4l2_buffer_swframe_to_buf(const AVFrame *frame, V4L2Buffer *out) { int i, ret; struct v4l2_format fmt = out->context->format; int pixel_format = V4L2_TYPE_IS_MULTIPLANAR(fmt.type) ? fmt.fmt.pix_mp.pixelformat : fmt.fmt.pix.pixelformat; int height = V4L2_TYPE_IS_MULTIPLANAR(fmt.type) ? fmt.fmt.pix_mp.height : fmt.fmt.pix.height; int is_planar_format = 0; switch (pixel_format) { case V4L2_PIX_FMT_YUV420M: case V4L2_PIX_FMT_YVU420M: #ifdef V4L2_PIX_FMT_YUV422M case V4L2_PIX_FMT_YUV422M: #endif #ifdef V4L2_PIX_FMT_YVU422M case V4L2_PIX_FMT_YVU422M: #endif #ifdef V4L2_PIX_FMT_YUV444M case V4L2_PIX_FMT_YUV444M: #endif #ifdef V4L2_PIX_FMT_YVU444M case V4L2_PIX_FMT_YVU444M: #endif case V4L2_PIX_FMT_NV12M: case V4L2_PIX_FMT_NV21M: case V4L2_PIX_FMT_NV12MT_16X16: case V4L2_PIX_FMT_NV12MT: case V4L2_PIX_FMT_NV16M: case V4L2_PIX_FMT_NV61M: is_planar_format = 1; } if (!is_planar_format) { const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format); int planes_nb = 0; int offset = 0; for (i = 0; i < desc->nb_components; i++) planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1); for (i = 0; i < planes_nb; i++) { int size, h = height; if (i == 1 || i == 2) { h = AV_CEIL_RSHIFT(h, desc->log2_chroma_h); } size = frame->linesize[i] * h; ret = v4l2_bufref_to_buf(out, 0, frame->data[i], size, offset, frame->buf[i]); if (ret) return ret; offset += size; } return 0; } for (i = 0; i < out->num_planes; i++) { ret = v4l2_bufref_to_buf(out, i, frame->buf[i]->data, frame->buf[i]->size, 0, frame->buf[i]); if (ret) return ret; } return 0; } /****************************************************************************** * * V4L2Buffer interface * ******************************************************************************/ int ff_v4l2_buffer_avframe_to_buf(const AVFrame *frame, V4L2Buffer *out) { v4l2_set_pts(out, frame->pts); return v4l2_buffer_swframe_to_buf(frame, out); } int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame, V4L2Buffer *avbuf) { int ret; av_frame_unref(frame); /* 1. get references to the actual data */ ret = v4l2_buffer_buf_to_swframe(frame, avbuf); if (ret) return ret; /* 2. get frame information */ frame->key_frame = !!(avbuf->buf.flags & V4L2_BUF_FLAG_KEYFRAME); frame->color_primaries = v4l2_get_color_primaries(avbuf); frame->colorspace = v4l2_get_color_space(avbuf); frame->color_range = v4l2_get_color_range(avbuf); frame->color_trc = v4l2_get_color_trc(avbuf); frame->pts = v4l2_get_pts(avbuf); frame->pkt_dts = AV_NOPTS_VALUE; /* these values are updated also during re-init in v4l2_process_driver_event */ frame->height = avbuf->context->height; frame->width = avbuf->context->width; frame->sample_aspect_ratio = avbuf->context->sample_aspect_ratio; /* 3. report errors upstream */ if (avbuf->buf.flags & V4L2_BUF_FLAG_ERROR) { av_log(logger(avbuf), AV_LOG_ERROR, "%s: driver decode error\n", avbuf->context->name); frame->decode_error_flags |= FF_DECODE_ERROR_INVALID_BITSTREAM; } return 0; } int ff_v4l2_buffer_buf_to_avpkt(AVPacket *pkt, V4L2Buffer *avbuf) { int ret; av_packet_unref(pkt); ret = v4l2_buf_to_bufref(avbuf, 0, &pkt->buf); if (ret) return ret; pkt->size = V4L2_TYPE_IS_MULTIPLANAR(avbuf->buf.type) ? avbuf->buf.m.planes[0].bytesused : avbuf->buf.bytesused; pkt->data = pkt->buf->data; if (avbuf->buf.flags & V4L2_BUF_FLAG_KEYFRAME) pkt->flags |= AV_PKT_FLAG_KEY; if (avbuf->buf.flags & V4L2_BUF_FLAG_ERROR) { av_log(logger(avbuf), AV_LOG_ERROR, "%s driver encode error\n", avbuf->context->name); pkt->flags |= AV_PKT_FLAG_CORRUPT; } pkt->dts = pkt->pts = v4l2_get_pts(avbuf); return 0; } int ff_v4l2_buffer_avpkt_to_buf(const AVPacket *pkt, V4L2Buffer *out) { int ret; ret = v4l2_bufref_to_buf(out, 0, pkt->data, pkt->size, 0, pkt->buf); if (ret) return ret; v4l2_set_pts(out, pkt->pts); if (pkt->flags & AV_PKT_FLAG_KEY) out->flags = V4L2_BUF_FLAG_KEYFRAME; return 0; } int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index) { V4L2Context *ctx = avbuf->context; int ret, i; avbuf->buf.memory = V4L2_MEMORY_MMAP; avbuf->buf.type = ctx->type; avbuf->buf.index = index; if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) { avbuf->buf.length = VIDEO_MAX_PLANES; avbuf->buf.m.planes = avbuf->planes; } ret = ioctl(buf_to_m2mctx(avbuf)->fd, VIDIOC_QUERYBUF, &avbuf->buf); if (ret < 0) return AVERROR(errno); if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) { avbuf->num_planes = 0; /* in MP, the V4L2 API states that buf.length means num_planes */ for (i = 0; i < avbuf->buf.length; i++) { if (avbuf->buf.m.planes[i].length) avbuf->num_planes++; } } else avbuf->num_planes = 1; for (i = 0; i < avbuf->num_planes; i++) { avbuf->plane_info[i].bytesperline = V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[i].bytesperline : ctx->format.fmt.pix.bytesperline; if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) { avbuf->plane_info[i].length = avbuf->buf.m.planes[i].length; avbuf->plane_info[i].mm_addr = mmap(NULL, avbuf->buf.m.planes[i].length, PROT_READ | PROT_WRITE, MAP_SHARED, buf_to_m2mctx(avbuf)->fd, avbuf->buf.m.planes[i].m.mem_offset); } else { avbuf->plane_info[i].length = avbuf->buf.length; avbuf->plane_info[i].mm_addr = mmap(NULL, avbuf->buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, buf_to_m2mctx(avbuf)->fd, avbuf->buf.m.offset); } if (avbuf->plane_info[i].mm_addr == MAP_FAILED) return AVERROR(ENOMEM); } avbuf->status = V4L2BUF_AVAILABLE; if (V4L2_TYPE_IS_OUTPUT(ctx->type)) return 0; if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) { avbuf->buf.m.planes = avbuf->planes; avbuf->buf.length = avbuf->num_planes; } else { avbuf->buf.bytesused = avbuf->planes[0].bytesused; avbuf->buf.length = avbuf->planes[0].length; } return ff_v4l2_buffer_enqueue(avbuf); } int ff_v4l2_buffer_enqueue(V4L2Buffer* avbuf) { int ret; avbuf->buf.flags = avbuf->flags; ret = ioctl(buf_to_m2mctx(avbuf)->fd, VIDIOC_QBUF, &avbuf->buf); if (ret < 0) return AVERROR(errno); avbuf->status = V4L2BUF_IN_DRIVER; return 0; }