3 * Copyright (c) 2015 Rodger Combs
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include <interface/mmal/mmal.h>
29 #include <interface/mmal/mmal_parameters_video.h>
30 #include <interface/mmal/util/mmal_util.h>
31 #include <interface/mmal/util/mmal_util_params.h>
32 #include <interface/mmal/util/mmal_default_components.h>
33 #include <interface/mmal/vc/mmal_vc_api.h>
34 #include <stdatomic.h>
38 #include "libavutil/avassert.h"
39 #include "libavutil/buffer.h"
40 #include "libavutil/common.h"
41 #include "libavutil/imgutils.h"
42 #include "libavutil/opt.h"
43 #include "libavutil/log.h"
45 typedef struct FFBufferEntry {
51 struct FFBufferEntry *next;
54 // MMAL_POOL_T destroys all of its MMAL_BUFFER_HEADER_Ts. If we want correct
55 // refcounting for AVFrames, we can free the MMAL_POOL_T only after all AVFrames
56 // have been unreferenced.
57 typedef struct FFPoolRef {
62 typedef struct FFBufferRef {
63 MMAL_BUFFER_HEADER_T *buffer;
67 typedef struct MMALDecodeContext {
70 int extra_decoder_buffers;
72 MMAL_COMPONENT_T *decoder;
73 MMAL_QUEUE_T *queue_decoded_frames;
77 // Waiting input packets. Because the libavcodec API requires decoding and
78 // returning packets in lockstep, it can happen that queue_decoded_frames
79 // contains almost all surfaces - then the decoder input queue can quickly
80 // fill up and won't accept new input either. Without consuming input, the
81 // libavcodec API can't return new frames, and we have a logical deadlock.
82 // This is avoided by queuing such buffers here.
83 FFBufferEntry *waiting_buffers, *waiting_buffers_tail;
86 atomic_int packets_buffered;
87 int64_t frames_output;
95 // Assume decoder is guaranteed to produce output after at least this many
96 // packets (where each packet contains 1 frame).
97 #define MAX_DELAYED_FRAMES 16
99 static void ffmmal_poolref_unref(FFPoolRef *ref)
102 atomic_fetch_add_explicit(&ref->refcount, -1, memory_order_acq_rel) == 1) {
103 mmal_pool_destroy(ref->pool);
108 static void ffmmal_release_frame(void *opaque, uint8_t *data)
110 FFBufferRef *ref = (void *)data;
112 mmal_buffer_header_release(ref->buffer);
113 ffmmal_poolref_unref(ref->pool);
118 // Setup frame with a new reference to buffer. The buffer must have been
119 // allocated from the given pool.
120 static int ffmmal_set_ref(AVFrame *frame, FFPoolRef *pool,
121 MMAL_BUFFER_HEADER_T *buffer)
123 FFBufferRef *ref = av_mallocz(sizeof(*ref));
125 return AVERROR(ENOMEM);
128 ref->buffer = buffer;
130 frame->buf[0] = av_buffer_create((void *)ref, sizeof(*ref),
131 ffmmal_release_frame, NULL,
132 AV_BUFFER_FLAG_READONLY);
133 if (!frame->buf[0]) {
135 return AVERROR(ENOMEM);
138 atomic_fetch_add_explicit(&ref->pool->refcount, 1, memory_order_relaxed);
139 mmal_buffer_header_acquire(buffer);
141 frame->format = AV_PIX_FMT_MMAL;
142 frame->data[3] = (uint8_t *)ref->buffer;
146 static void ffmmal_stop_decoder(AVCodecContext *avctx)
148 MMALDecodeContext *ctx = avctx->priv_data;
149 MMAL_COMPONENT_T *decoder = ctx->decoder;
150 MMAL_BUFFER_HEADER_T *buffer;
152 mmal_port_disable(decoder->input[0]);
153 mmal_port_disable(decoder->output[0]);
154 mmal_port_disable(decoder->control);
156 mmal_port_flush(decoder->input[0]);
157 mmal_port_flush(decoder->output[0]);
158 mmal_port_flush(decoder->control);
160 while ((buffer = mmal_queue_get(ctx->queue_decoded_frames)))
161 mmal_buffer_header_release(buffer);
163 while (ctx->waiting_buffers) {
164 FFBufferEntry *buffer = ctx->waiting_buffers;
166 ctx->waiting_buffers = buffer->next;
168 if (buffer->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
169 atomic_fetch_add(&ctx->packets_buffered, -1);
171 av_buffer_unref(&buffer->ref);
174 ctx->waiting_buffers_tail = NULL;
176 av_assert0(atomic_load(&ctx->packets_buffered) == 0);
178 ctx->frames_output = ctx->eos_received = ctx->eos_sent = ctx->packets_sent = ctx->extradata_sent = 0;
181 static av_cold int ffmmal_close_decoder(AVCodecContext *avctx)
183 MMALDecodeContext *ctx = avctx->priv_data;
186 ffmmal_stop_decoder(avctx);
188 mmal_component_destroy(ctx->decoder);
190 mmal_queue_destroy(ctx->queue_decoded_frames);
191 mmal_pool_destroy(ctx->pool_in);
192 ffmmal_poolref_unref(ctx->pool_out);
199 static void input_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
201 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
202 MMALDecodeContext *ctx = avctx->priv_data;
205 FFBufferEntry *entry = buffer->user_data;
206 av_buffer_unref(&entry->ref);
207 if (entry->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
208 atomic_fetch_add(&ctx->packets_buffered, -1);
211 mmal_buffer_header_release(buffer);
214 static void output_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
216 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
217 MMALDecodeContext *ctx = avctx->priv_data;
219 mmal_queue_put(ctx->queue_decoded_frames, buffer);
222 static void control_port_cb(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
224 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
225 MMAL_STATUS_T status;
227 if (buffer->cmd == MMAL_EVENT_ERROR) {
228 status = *(uint32_t *)buffer->data;
229 av_log(avctx, AV_LOG_ERROR, "MMAL error %d on control port\n", (int)status);
231 av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on control port\n",
232 av_fourcc2str(buffer->cmd));
235 mmal_buffer_header_release(buffer);
238 // Feed free output buffers to the decoder.
239 static int ffmmal_fill_output_port(AVCodecContext *avctx)
241 MMALDecodeContext *ctx = avctx->priv_data;
242 MMAL_BUFFER_HEADER_T *buffer;
243 MMAL_STATUS_T status;
246 return AVERROR_UNKNOWN; // format change code failed with OOM previously
248 while ((buffer = mmal_queue_get(ctx->pool_out->pool->queue))) {
249 if ((status = mmal_port_send_buffer(ctx->decoder->output[0], buffer))) {
250 mmal_buffer_header_release(buffer);
251 av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending output buffer.\n", (int)status);
252 return AVERROR_UNKNOWN;
259 static enum AVColorSpace ffmmal_csp_to_av_csp(MMAL_FOURCC_T fourcc)
262 case MMAL_COLOR_SPACE_BT470_2_BG:
263 case MMAL_COLOR_SPACE_BT470_2_M:
264 case MMAL_COLOR_SPACE_ITUR_BT601: return AVCOL_SPC_BT470BG;
265 case MMAL_COLOR_SPACE_ITUR_BT709: return AVCOL_SPC_BT709;
266 case MMAL_COLOR_SPACE_FCC: return AVCOL_SPC_FCC;
267 case MMAL_COLOR_SPACE_SMPTE240M: return AVCOL_SPC_SMPTE240M;
268 default: return AVCOL_SPC_UNSPECIFIED;
272 static int ffmal_update_format(AVCodecContext *avctx)
274 MMALDecodeContext *ctx = avctx->priv_data;
275 MMAL_STATUS_T status;
277 MMAL_COMPONENT_T *decoder = ctx->decoder;
278 MMAL_ES_FORMAT_T *format_out = decoder->output[0]->format;
279 MMAL_PARAMETER_VIDEO_INTERLACE_TYPE_T interlace_type;
281 ffmmal_poolref_unref(ctx->pool_out);
282 if (!(ctx->pool_out = av_mallocz(sizeof(*ctx->pool_out)))) {
283 ret = AVERROR(ENOMEM);
286 atomic_init(&ctx->pool_out->refcount, 1);
291 if ((status = mmal_port_parameter_set_uint32(decoder->output[0], MMAL_PARAMETER_EXTRA_BUFFERS, ctx->extra_buffers)))
294 if ((status = mmal_port_parameter_set_boolean(decoder->output[0], MMAL_PARAMETER_VIDEO_INTERPOLATE_TIMESTAMPS, 0)))
297 if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
298 format_out->encoding = MMAL_ENCODING_OPAQUE;
300 format_out->encoding_variant = format_out->encoding = MMAL_ENCODING_I420;
303 if ((status = mmal_port_format_commit(decoder->output[0])))
306 interlace_type.hdr.id = MMAL_PARAMETER_VIDEO_INTERLACE_TYPE;
307 interlace_type.hdr.size = sizeof(MMAL_PARAMETER_VIDEO_INTERLACE_TYPE_T);
308 status = mmal_port_parameter_get(decoder->output[0], &interlace_type.hdr);
309 if (status != MMAL_SUCCESS) {
310 av_log(avctx, AV_LOG_ERROR, "Cannot read MMAL interlace information!\n");
312 ctx->interlaced_frame = (interlace_type.eMode != MMAL_InterlaceProgressive);
313 ctx->top_field_first = (interlace_type.eMode == MMAL_InterlaceFieldsInterleavedUpperFirst);
316 if ((ret = ff_set_dimensions(avctx, format_out->es->video.crop.x + format_out->es->video.crop.width,
317 format_out->es->video.crop.y + format_out->es->video.crop.height)) < 0)
320 if (format_out->es->video.par.num && format_out->es->video.par.den) {
321 avctx->sample_aspect_ratio.num = format_out->es->video.par.num;
322 avctx->sample_aspect_ratio.den = format_out->es->video.par.den;
324 if (format_out->es->video.frame_rate.num && format_out->es->video.frame_rate.den) {
325 avctx->framerate.num = format_out->es->video.frame_rate.num;
326 avctx->framerate.den = format_out->es->video.frame_rate.den;
329 avctx->colorspace = ffmmal_csp_to_av_csp(format_out->es->video.color_space);
331 decoder->output[0]->buffer_size =
332 FFMAX(decoder->output[0]->buffer_size_min, decoder->output[0]->buffer_size_recommended);
333 decoder->output[0]->buffer_num =
334 FFMAX(decoder->output[0]->buffer_num_min, decoder->output[0]->buffer_num_recommended) + ctx->extra_buffers;
335 ctx->pool_out->pool = mmal_pool_create(decoder->output[0]->buffer_num,
336 decoder->output[0]->buffer_size);
337 if (!ctx->pool_out->pool) {
338 ret = AVERROR(ENOMEM);
345 return ret < 0 ? ret : AVERROR_UNKNOWN;
348 static av_cold int ffmmal_init_decoder(AVCodecContext *avctx)
350 MMALDecodeContext *ctx = avctx->priv_data;
351 MMAL_STATUS_T status;
352 MMAL_ES_FORMAT_T *format_in;
353 MMAL_COMPONENT_T *decoder;
358 if (mmal_vc_init()) {
359 av_log(avctx, AV_LOG_ERROR, "Cannot initialize MMAL VC driver!\n");
360 return AVERROR(ENOSYS);
363 if ((ret = ff_get_format(avctx, avctx->codec->pix_fmts)) < 0)
366 avctx->pix_fmt = ret;
368 if ((status = mmal_component_create(MMAL_COMPONENT_DEFAULT_VIDEO_DECODER, &ctx->decoder)))
371 decoder = ctx->decoder;
373 format_in = decoder->input[0]->format;
374 format_in->type = MMAL_ES_TYPE_VIDEO;
375 switch (avctx->codec_id) {
376 case AV_CODEC_ID_MPEG2VIDEO:
377 format_in->encoding = MMAL_ENCODING_MP2V;
379 case AV_CODEC_ID_MPEG4:
380 format_in->encoding = MMAL_ENCODING_MP4V;
382 case AV_CODEC_ID_VC1:
383 format_in->encoding = MMAL_ENCODING_WVC1;
385 case AV_CODEC_ID_H264:
387 format_in->encoding = MMAL_ENCODING_H264;
390 format_in->es->video.width = FFALIGN(avctx->width, 32);
391 format_in->es->video.height = FFALIGN(avctx->height, 16);
392 format_in->es->video.crop.width = avctx->width;
393 format_in->es->video.crop.height = avctx->height;
394 format_in->es->video.frame_rate.num = 24000;
395 format_in->es->video.frame_rate.den = 1001;
396 format_in->es->video.par.num = avctx->sample_aspect_ratio.num;
397 format_in->es->video.par.den = avctx->sample_aspect_ratio.den;
398 format_in->flags = MMAL_ES_FORMAT_FLAG_FRAMED;
400 av_log(avctx, AV_LOG_DEBUG, "Using MMAL %s encoding.\n",
401 av_fourcc2str(format_in->encoding));
403 #if HAVE_MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS
404 if (mmal_port_parameter_set_uint32(decoder->input[0], MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS,
405 -1 - ctx->extra_decoder_buffers)) {
406 av_log(avctx, AV_LOG_WARNING, "Could not set input buffering limit.\n");
410 if ((status = mmal_port_format_commit(decoder->input[0])))
413 decoder->input[0]->buffer_num =
414 FFMAX(decoder->input[0]->buffer_num_min, 20);
415 decoder->input[0]->buffer_size =
416 FFMAX(decoder->input[0]->buffer_size_min, 512 * 1024);
417 ctx->pool_in = mmal_pool_create(decoder->input[0]->buffer_num, 0);
419 ret = AVERROR(ENOMEM);
423 if ((ret = ffmal_update_format(avctx)) < 0)
426 ctx->queue_decoded_frames = mmal_queue_create();
427 if (!ctx->queue_decoded_frames)
430 decoder->input[0]->userdata = (void*)avctx;
431 decoder->output[0]->userdata = (void*)avctx;
432 decoder->control->userdata = (void*)avctx;
434 if ((status = mmal_port_enable(decoder->control, control_port_cb)))
436 if ((status = mmal_port_enable(decoder->input[0], input_callback)))
438 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
441 if ((status = mmal_component_enable(decoder)))
447 ffmmal_close_decoder(avctx);
448 return ret < 0 ? ret : AVERROR_UNKNOWN;
451 static void ffmmal_flush(AVCodecContext *avctx)
453 MMALDecodeContext *ctx = avctx->priv_data;
454 MMAL_COMPONENT_T *decoder = ctx->decoder;
455 MMAL_STATUS_T status;
457 ffmmal_stop_decoder(avctx);
459 if ((status = mmal_port_enable(decoder->control, control_port_cb)))
461 if ((status = mmal_port_enable(decoder->input[0], input_callback)))
463 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
469 av_log(avctx, AV_LOG_ERROR, "MMAL flush error: %i\n", (int)status);
472 // Split packets and add them to the waiting_buffers list. We don't queue them
473 // immediately, because it can happen that the decoder is temporarily blocked
474 // (due to us not reading/returning enough output buffers) and won't accept
475 // new input. (This wouldn't be an issue if MMAL input buffers always were
476 // complete frames - then the input buffer just would have to be big enough.)
477 // If is_extradata is set, send it as MMAL_BUFFER_HEADER_FLAG_CONFIG.
478 static int ffmmal_add_packet(AVCodecContext *avctx, AVPacket *avpkt,
481 MMALDecodeContext *ctx = avctx->priv_data;
482 AVBufferRef *buf = NULL;
484 uint8_t *data = (uint8_t *)"";
490 buf = av_buffer_ref(avpkt->buf);
494 buf = av_buffer_alloc(avpkt->size);
496 memcpy(buf->data, avpkt->data, avpkt->size);
502 ret = AVERROR(ENOMEM);
510 if (!ctx->packets_sent) {
511 // Short-cut the flush logic to avoid upsetting MMAL.
513 ctx->eos_received = 1;
521 FFBufferEntry *buffer = av_mallocz(sizeof(*buffer));
523 ret = AVERROR(ENOMEM);
528 buffer->length = FFMIN(size, ctx->decoder->input[0]->buffer_size);
531 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_CONFIG;
534 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_START;
536 data += buffer->length;
537 size -= buffer->length;
539 buffer->pts = avpkt->pts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->pts;
540 buffer->dts = avpkt->dts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->dts;
543 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_END;
544 atomic_fetch_add(&ctx->packets_buffered, 1);
547 if (!buffer->length) {
548 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_EOS;
553 buffer->ref = av_buffer_ref(buf);
556 ret = AVERROR(ENOMEM);
561 // Insert at end of the list
562 if (!ctx->waiting_buffers)
563 ctx->waiting_buffers = buffer;
564 if (ctx->waiting_buffers_tail)
565 ctx->waiting_buffers_tail->next = buffer;
566 ctx->waiting_buffers_tail = buffer;
570 av_buffer_unref(&buf);
574 // Move prepared/split packets from waiting_buffers to the MMAL decoder.
575 static int ffmmal_fill_input_port(AVCodecContext *avctx)
577 MMALDecodeContext *ctx = avctx->priv_data;
579 while (ctx->waiting_buffers) {
580 MMAL_BUFFER_HEADER_T *mbuffer;
581 FFBufferEntry *buffer;
582 MMAL_STATUS_T status;
584 mbuffer = mmal_queue_get(ctx->pool_in->queue);
588 buffer = ctx->waiting_buffers;
590 mmal_buffer_header_reset(mbuffer);
592 mbuffer->pts = buffer->pts;
593 mbuffer->dts = buffer->dts;
594 mbuffer->flags = buffer->flags;
595 mbuffer->data = buffer->data;
596 mbuffer->length = buffer->length;
597 mbuffer->user_data = buffer;
598 mbuffer->alloc_size = ctx->decoder->input[0]->buffer_size;
600 // Remove from start of the list
601 ctx->waiting_buffers = buffer->next;
602 if (ctx->waiting_buffers_tail == buffer)
603 ctx->waiting_buffers_tail = NULL;
605 if ((status = mmal_port_send_buffer(ctx->decoder->input[0], mbuffer))) {
606 mmal_buffer_header_release(mbuffer);
607 av_buffer_unref(&buffer->ref);
608 if (buffer->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
609 atomic_fetch_add(&ctx->packets_buffered, -1);
614 av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending input\n", (int)status);
615 return AVERROR_UNKNOWN;
622 static int ffmal_copy_frame(AVCodecContext *avctx, AVFrame *frame,
623 MMAL_BUFFER_HEADER_T *buffer)
625 MMALDecodeContext *ctx = avctx->priv_data;
628 frame->interlaced_frame = ctx->interlaced_frame;
629 frame->top_field_first = ctx->top_field_first;
631 if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
633 return AVERROR_UNKNOWN; // format change code failed with OOM previously
635 if ((ret = ff_decode_frame_props(avctx, frame)) < 0)
638 if ((ret = ffmmal_set_ref(frame, ctx->pool_out, buffer)) < 0)
641 int w = FFALIGN(avctx->width, 32);
642 int h = FFALIGN(avctx->height, 16);
646 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
649 av_image_fill_arrays(src, linesize,
650 buffer->data + buffer->type->video.offset[0],
651 avctx->pix_fmt, w, h, 1);
652 av_image_copy(frame->data, frame->linesize, src, linesize,
653 avctx->pix_fmt, avctx->width, avctx->height);
656 frame->pts = buffer->pts == MMAL_TIME_UNKNOWN ? AV_NOPTS_VALUE : buffer->pts;
658 FF_DISABLE_DEPRECATION_WARNINGS
659 frame->pkt_pts = frame->pts;
660 FF_ENABLE_DEPRECATION_WARNINGS
662 frame->pkt_dts = AV_NOPTS_VALUE;
668 // Fetch a decoded buffer and place it into the frame parameter.
669 static int ffmmal_read_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
671 MMALDecodeContext *ctx = avctx->priv_data;
672 MMAL_BUFFER_HEADER_T *buffer = NULL;
673 MMAL_STATUS_T status = 0;
676 if (ctx->eos_received)
680 // To ensure decoding in lockstep with a constant delay between fed packets
681 // and output frames, we always wait until an output buffer is available.
682 // Except during start we don't know after how many input packets the decoder
683 // is going to return the first buffer, and we can't distinguish decoder
684 // being busy from decoder waiting for input. So just poll at the start and
685 // keep feeding new data to the buffer.
686 // We are pretty sure the decoder will produce output if we sent more input
687 // frames than what a H.264 decoder could logically delay. This avoids too
688 // excessive buffering.
689 // We also wait if we sent eos, but didn't receive it yet (think of decoding
690 // stream with a very low number of frames).
691 if (atomic_load(&ctx->packets_buffered) > MAX_DELAYED_FRAMES ||
692 (ctx->packets_sent && ctx->eos_sent)) {
693 // MMAL will ignore broken input packets, which means the frame we
694 // expect here may never arrive. Dealing with this correctly is
695 // complicated, so here's a hack to avoid that it freezes forever
696 // in this unlikely situation.
697 buffer = mmal_queue_timedwait(ctx->queue_decoded_frames, 100);
699 av_log(avctx, AV_LOG_ERROR, "Did not get output frame from MMAL.\n");
700 ret = AVERROR_UNKNOWN;
704 buffer = mmal_queue_get(ctx->queue_decoded_frames);
709 ctx->eos_received |= !!(buffer->flags & MMAL_BUFFER_HEADER_FLAG_EOS);
710 if (ctx->eos_received)
713 if (buffer->cmd == MMAL_EVENT_FORMAT_CHANGED) {
714 MMAL_COMPONENT_T *decoder = ctx->decoder;
715 MMAL_EVENT_FORMAT_CHANGED_T *ev = mmal_event_format_changed_get(buffer);
716 MMAL_BUFFER_HEADER_T *stale_buffer;
718 av_log(avctx, AV_LOG_INFO, "Changing output format.\n");
720 if ((status = mmal_port_disable(decoder->output[0])))
723 while ((stale_buffer = mmal_queue_get(ctx->queue_decoded_frames)))
724 mmal_buffer_header_release(stale_buffer);
726 mmal_format_copy(decoder->output[0]->format, ev->format);
728 if ((ret = ffmal_update_format(avctx)) < 0)
731 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
734 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
737 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
740 mmal_buffer_header_release(buffer);
742 } else if (buffer->cmd) {
743 av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on output port\n",
744 av_fourcc2str(buffer->cmd));
746 } else if (buffer->length == 0) {
747 // Unused output buffer that got drained after format change.
748 mmal_buffer_header_release(buffer);
752 ctx->frames_output++;
754 if ((ret = ffmal_copy_frame(avctx, frame, buffer)) < 0)
763 mmal_buffer_header_release(buffer);
764 if (status && ret >= 0)
765 ret = AVERROR_UNKNOWN;
769 static int ffmmal_decode(AVCodecContext *avctx, void *data, int *got_frame,
772 MMALDecodeContext *ctx = avctx->priv_data;
773 AVFrame *frame = data;
776 if (avctx->extradata_size && !ctx->extradata_sent) {
778 av_init_packet(&pkt);
779 pkt.data = avctx->extradata;
780 pkt.size = avctx->extradata_size;
781 ctx->extradata_sent = 1;
782 if ((ret = ffmmal_add_packet(avctx, &pkt, 1)) < 0)
786 if ((ret = ffmmal_add_packet(avctx, avpkt, 0)) < 0)
789 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
792 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
795 if ((ret = ffmmal_read_frame(avctx, frame, got_frame)) < 0)
798 // ffmmal_read_frame() can block for a while. Since the decoder is
799 // asynchronous, it's a good idea to fill the ports again.
801 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
804 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
810 AVHWAccel ff_h264_mmal_hwaccel = {
812 .type = AVMEDIA_TYPE_VIDEO,
813 .id = AV_CODEC_ID_H264,
814 .pix_fmt = AV_PIX_FMT_MMAL,
817 AVHWAccel ff_mpeg2_mmal_hwaccel = {
818 .name = "mpeg2_mmal",
819 .type = AVMEDIA_TYPE_VIDEO,
820 .id = AV_CODEC_ID_MPEG2VIDEO,
821 .pix_fmt = AV_PIX_FMT_MMAL,
824 AVHWAccel ff_mpeg4_mmal_hwaccel = {
825 .name = "mpeg4_mmal",
826 .type = AVMEDIA_TYPE_VIDEO,
827 .id = AV_CODEC_ID_MPEG4,
828 .pix_fmt = AV_PIX_FMT_MMAL,
831 AVHWAccel ff_vc1_mmal_hwaccel = {
833 .type = AVMEDIA_TYPE_VIDEO,
834 .id = AV_CODEC_ID_VC1,
835 .pix_fmt = AV_PIX_FMT_MMAL,
838 static const AVOption options[]={
839 {"extra_buffers", "extra buffers", offsetof(MMALDecodeContext, extra_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
840 {"extra_decoder_buffers", "extra MMAL internal buffered frames", offsetof(MMALDecodeContext, extra_decoder_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
844 #define FFMMAL_DEC_CLASS(NAME) \
845 static const AVClass ffmmal_##NAME##_dec_class = { \
846 .class_name = "mmal_" #NAME "_dec", \
847 .item_name = av_default_item_name, \
849 .version = LIBAVUTIL_VERSION_INT, \
852 #define FFMMAL_DEC(NAME, ID) \
853 FFMMAL_DEC_CLASS(NAME) \
854 AVCodec ff_##NAME##_mmal_decoder = { \
855 .name = #NAME "_mmal", \
856 .long_name = NULL_IF_CONFIG_SMALL(#NAME " (mmal)"), \
857 .type = AVMEDIA_TYPE_VIDEO, \
859 .priv_data_size = sizeof(MMALDecodeContext), \
860 .init = ffmmal_init_decoder, \
861 .close = ffmmal_close_decoder, \
862 .decode = ffmmal_decode, \
863 .flush = ffmmal_flush, \
864 .priv_class = &ffmmal_##NAME##_dec_class, \
865 .capabilities = AV_CODEC_CAP_DELAY, \
866 .caps_internal = FF_CODEC_CAP_SETS_PKT_DTS, \
867 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MMAL, \
868 AV_PIX_FMT_YUV420P, \
872 FFMMAL_DEC(h264, AV_CODEC_ID_H264)
873 FFMMAL_DEC(mpeg2, AV_CODEC_ID_MPEG2VIDEO)
874 FFMMAL_DEC(mpeg4, AV_CODEC_ID_MPEG4)
875 FFMMAL_DEC(vc1, AV_CODEC_ID_VC1)